Making rubber tubing and machinery therefor



(No Model.) i

T. J. MAYALL.

Making Rubber Tubing and Machinery Ther'efor. l Np. 241,231. Patented May "IO, 188|.v

s UNITED STATES THOMAS J. MAYALL, OF READING, MASSACHUSETTS.

PATENT OFFICE.

MAKING RUBBER TUBING AND MACHINERY THEREFOR."V

SPECIFICATION forming part of Letters Patent No. 241,231, dated May 10, 1881. Application filed March Q4, 188i. (No model.)

To all whom it may concern Be it known that I, THOMAS J. MAYALL, of Reading, in the county of Middlesex and Commonwealth of Massachusetts, have invented a new and useful improvement in the method or process of making tubing of india rubber ground and mixed with the proper chemical substances for vulcanizing, and machinery for working the process, of which the following is a specification.

The method or process and the machinery for working it are sointimately connected that both must be described together.

In the drawings annexed, Figure l shows a perspective of the machine and its several parts. Fig. 2 shows a longitudinal sectional .View of a jacketed cylinder and the connected parts. Fig. 3 shows a detail of a portion of the drivinggear by which the machine is actuated.

The same letters indicate the same parts in each of the diderent figures.

a is a double or ljacketed cylinder, of cast iron or other suitable metal,having cylindrical chamber within the inner plate, which is marked c.

ais a hollow shaft ex tending the whole length of the chamber c and through and resting in the supports at the rear ofthe chamber marked a9 a9.

Firmly fixed on the hollow shaft c2 is a foilower marked al, the diameter of which is such that it will just go into and closely fit the in ner bore of the chamber a.

e4 is the space between the outer and inner shells of the cylinder a.

a5 is a conducting-pipe for the introduction of steam between the outer and inner shells of the chamber a.

a is an opening in the outer shell of the cylinder a., through which the bulb of a thermometer may be introduced, and which may be closed by any suitable means around the tube of the thermometer, leaving the graduated tube and scale outside for observation.

al is a funnel-shaped head on the forward end of the cylinder a.

ci* a are metal rods or shafts of a size to have sufficient strength to force the follower a3 into the chamber a', and extend rearward from the follower c3 by the supports a9 af" to and connect with a yoke on the screw marked c.

c is a male screw running into the female screw marked c', and has a yoke or cross-head on its forward end, to which the shafts a8 a are connected. y

c' is a hollow shaft with a screw-thread inside, into which the thread of the screw c works and revolves in the bearings c2 c2.

c3 is a gear-wheel on the rear end of the hol low shaft c.

c4 is a handle or crank pin on the gearwheel c3.

c5 is a driving-shaft. at right angles to the hollow shaft c', and carries a worin-gear on it, (marked 06,) which works into the teeth of the gear-wheel c3.

c7 is a cam on the driving-shaft c5, working in a socket in the supporting-block marked o8, which, moved forward by the lever marked c, throws theworm-gear c6 into the teeth of the gear-wheel c3, so that the revolution ofthe shaft c5 will revolve the gear-wheel c3 and the hollow shaft c', and a reverse motion of the lever e9 throws the worm c6 out of the teeth of the gear-wheelc3, the motion of which then ceases.

e is apulley on the shaft c5, with abelt marked c running over it, and a small pulley on the shaft of the fan-blower, (marked c2.)

0n the nozzle or outlet of the fan-blower e2 is placed a funnel-shaped receptacle for pulverized French chalk or other similar sub stance, which is marked c3, from the bottom of which there is a passage opening into the nozzle of the fan-blower c2.

From the nozzle ofthe fan-blower a pipe marked c4 extends to and into the hollow of the shaft c2.

i is the cone-shaped chamber in the head cl. i is a hollow mandrel, uponA which the rubber tube is to be formed, which is screwed into the forward end of the hollow shaft al, and extends forward and through the opening in the forward end ofthe cone-shaped head cl' and the cap i2.

i2 is a cap which goes onto the forward end of the cone-shaped head cl, with a hole in the center, the diameter of Ywhich forms the outside diameter ofthe rubber pipe, while the hollow mandrel t' tixes the inside diameter of the rubber tube, and the concentric space between the hollow mandrel i and the hole in the cap i2, which is marked 4, determines the thickness of the rubber forming the pipe.

ICO

The operation of the machine and the process of making india-rubber pipe with it are as follows: The chamber a is filled with rubber ground and mixed with the proper chemical and other substances for giving it consistency and strength, and for vulcanizing, and the follower a3 closed into the rear of the chamber. The box c3 is filled with pulverized talc, French chalk, or other equivalent substance. Steam is introduced into the space between the walls of the cylinder a until the whole mass of rubber and other substances incorporated with the rubberis in aplastic state. Motion is then given to the 1n achinc through the shaft c5. The worm c6, being thrown into the teeth of the gear-wheel c3, revolves it and the hollow shaft c', the screw-thread on the inside of which, Working on the screw c, throws it and the crosshead or yoke on its outer end and the shafts a8 a8 and the follower a3 slowly forward, forcing the plastic rubber in the chamber a out through the cone-shaped head i and the amulla-r space between the cap i2 and the hollow mandrel if, whence it slowly issues a perfectlyformed rubber pipe. The fan-blower c2, being in motion by the belt e', forces a current of air forward through the pipe c* into and through the hollow shaft a2 and the mandrel into the inside of the rubber tube which is being ejected through the annular openin g i, carrying a portion of the pulverized substance from the receptacle c3 into the inside of the rubber pipe as it passes from the machine. The inside of the rubber pipe being sticky, thc pulverized substance adheres to it and forms a coating ou it, which prevents the rubber from sticking together inside when collapsed by handling or otherwise.

The pipe issuing from the machine is cut ofi' in suitable or desirable lengths, and then vulcauized in the usual or by any suitable means, when it is ready for use.

Having thus described my invention and the method of practicing it, I claim as new- 1. The combination ot a jacketed cylinder, a hollow core or mandrel, a follower, anda fan-blower and tube connected with said core or mandrel, substantially as described.

2. The combination, with the hollow core or mandrel, of devices, as indicated, for forcing a pulvernlent preparation, such as chalk, through said core or mandrel into the interior of the pipe or tubing, as and forthe purpose set forth.

3. The process of making india-rubber tubing, consisting of preparing the rubber by grinding and mixing with proper chemical and other materials for vulcanizing, warming the mass until it is in a plastic state, forcing it by pressure from a chamber through an annular opening, and coating the inside of the pipe as it passes from the chamber with pulverized substance, substantially as described.

TI'IOS. J. MAYALL.

lVitnesses:

Cus. HoUGHroN, F. L. HoUGH'roN. 

